Added the Ash.Tab.TimeBetweenSwitchToExistingTabUserActions histogram to track time between tab swit

chrome/browser/ui/browser_command_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/browser_command_controller.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 407 matching lines @@
     case IDC_NEW_TAB:
       NewTab(browser_);
       break;
     case IDC_CLOSE_TAB:
       content::RecordAction(base::UserMetricsAction("CloseTabByKey"));
       CloseTab(browser_);
       break;
     case IDC_SELECT_NEXT_TAB:
       content::RecordAction(base::UserMetricsAction("Accel_SelectNextTab"));
       SelectNextTab(browser_);
+      // TODO(bruthig):
       break;
     case IDC_SELECT_PREVIOUS_TAB:
       content::RecordAction(
           base::UserMetricsAction("Accel_SelectPreviousTab"));
       SelectPreviousTab(browser_);
+      // TODO(bruthig):
       break;
     case IDC_MOVE_TAB_NEXT:
       MoveTabNext(browser_);
       break;
     case IDC_MOVE_TAB_PREVIOUS:
       MoveTabPrevious(browser_);
       break;
     case IDC_SELECT_TAB_0:
     case IDC_SELECT_TAB_1:
     case IDC_SELECT_TAB_2:
@@ skipping 914 matching lines @@
 
 BrowserWindow* BrowserCommandController::window() {
   return browser_->window();
 }
 
 Profile* BrowserCommandController::profile() {
   return browser_->profile();
 }
 
 }  // namespace chrome